GDataCopier looked like it would do the trick, but the current version (1.02) only seems to work with documents and spreadsheets. The feature list for the forthcoming version adds support for presentations, but there is no mention of PDFs.

GDocBackup doesn't work with PDFs and doesn't seem to have a command line option. I already had mono installed on my MacBook, so installed GDocBackup to try it out. First I got an cxception that boiled down to: